(1) The court may appoint an investigator in addition to a guardian ad litem or court-appointed special advocate under RCW 26.12.175 and 26.12.177 to assist the court and make recommendations.

(2) An investigator is a person appointed as an investigator under RCW 26.12.050(1)(b) or any other third-party professional ordered or appointed by the court to provide an opinion, assessment, or evaluation regarding the creation or modification of a parenting plan.

(3) Investigators who are not supervised by a guardian ad litem or by a court-appointed special advocate program must comply with the training requirements applicable to guardians ad litem or court-appointed special advocates as provided under this chapter and court rule.